air
blast
building
business
chemical
chemistry
chimney
construction
dirty
ecology
energy
engineering
environment
equipment
factory
foundry
furnace
gas
heat
heavy
hot
industrial
industry
iron
manufacture
manufacturing
melting
metal
metallurgical
metallurgy
mill
petrochemical
pipe
plant
pollution
power
production
sky
smelting
smog
smoke
smokestack
stack
station
steam
steel
technology
tube
work